Naolb



Jams, 1925- Re. 15,974

w. T. HooFNAGLE PROTECTIVE DEVICE FOR ELECTRIC FLATIRONS original FiledFeb. 1o, '1521 Elkann i Essex and State of vented certain new and usefu Im rovezi bustible support, such' asan Aproper current Reiaaued Jan. 6, 1925.

l Re, 15,974 l v WILLI T. HOOFNAGLE, 0F GLEN RIDGE, NEW JERSEY.

Original Io. 1,447,184,

To all 'whom may Be it known that I, WILLIAM T. HoornAe siding at Glen Ri in the county of ew Jerse have 1nments in Protective Devices for E ectric -Flatirons, of which the following 1s a speci- Y ication.

1I heating'of the iron; but if the iron 1s al-v lowed to stand 'the Vcurrent on,

it accumulates heat very rapidly, particularvly Vif it rests upon an 'ob]'ect which is a. poor conductor of heat. -In order to avoidl e0 lire and damage by over-heated irons, it is customs to lrest the iron one metal support, an to cut of current from the iron when not in use; butacareless operator will so upon a comlroning board or table, and'fail top cutfoi the current, with the result that the iron becomes overheated and sets lire to thesupport.

Thepurposeofthisinventionistoprovide means for automatically cutting oli thecurrent from the kelectric iron when the iron over-heaed, thereb preventing, e poilnh' 'ty'o setting to' objects upon which it.may be left stand- In carryingout the invention, I pro. lv-ieafuse socketonorinthebody of the iron, andl socket an ordinary-fuse ,having a fuseof the m ca to protectthemternalcirenitoftlcillnagainst exceive which may result from short so related tothe body of fle will heatedbythesole-plateoftheiron and will ha i lm't" fn vlewo same, msm een a citizen of the United' States, re-y 'plate 16, as shown at 16. The

DEVICE FOR FLATIBQNS.

dated February S17, 1923,'Serial No. 443,890, med Iebruary 10, 1921. Application for reissue nled September 80, 1924. Serial lo. 740,814.

Referring to the drawing, A indicatesl the iron comprising a meta base or soleplate 1, having an npturncd flange 1,"a resistance 2,"embedded in in'sulatlng material `3 which rests upon the base, a metal plate 4, resting upon the insulating material, and a top late 5, provided with a. handle 6, the inem r`s'1,54, and 5 being secured.I togetherb a screw 7. The plate 4 carries insulat metal connectors 8 and 9, havin openings 8 and 9, adapted to receive t e terminals 10 and 11 of an electric cord 12, `through which current is supplied to the resistance or heating element.

'lhe sole-plate of theiron is of the usual form, except that I provide a rearward extension 1", which is raised above the body of the plate, as shown, and sup rts a socket 13, .of insulating materi This sockethas oppositely projecting arms 13', which `are secured by screws 14` to ears 15, which project from lthe ilange 1FL 'The socket has an internal metal shell 14, screw# threaded to receive an ordinary fuse plug b.- The socket shown in the drawing is o n at its lower endtln ger that the ug `may engagea m 16 which' is arranged below the socket thin cup-shaped piece of in lsnlat material 3*, which electrically insulates body from the sole-plate of the iron but allows it to come close to. the plate so Vas to beheated thereb The fuse pl has the usual-externa y threadedmet shell 17, ada to make contact electrically with the i in the socket, 'and a base 18, adapted to rest againstthe metallbody 1 when the plug is in the socket. The fuse 19, indicated in dotted lines, is g within the plug and connectedto 'I3 :.1 and to its end contact, One end of the '2 isf-connected to the connector 9, as shown in Fig. 2, and end ofjthe 'is lconnectedto the sole-plate and will not be directly b the resistance 2, which heats the solep ate. This is important, because it is the sole-plate temperature which should control the melting of the fuse. The resistance is always at ared -heat While the current isl turned on, while the 'sole-plate will be cold at the start, at a safe workingtemperature while the iron is in use, and will reach the scorching temperature if left standing with 10' v 16, ythence through .the contact 18 at the base of the fuse plug and through the fuse to f the shell of the plug, thence to the shell of the socket, and thence through connections 20 and 21 to the connector 8. When the iron is in use, it does not become-excessively hot because this heat is dissipated in the fabrics on which it is operating. If the iron isallowed to stand, in one spot, With the current on, the iron becomes excessively hot, particularly if the support upon whichit is placed is a poor conductor of heat, such as Wood or cloth. This accumulation of` heat inthe sole-plate causes the plate 16 also to become very hot, and as the contact piece 18 of the fuse plug rests upon this plate, the latter also, and the fuse connected to it, will become excessively hot and the fuse will melt and interrupt the electric circuit `when the temperature of the 'fuse reaches the melting point. Thus, the current will be cut oil' and the iron will cool. Inorder to use the iron again, it will belnecessary to place a new fuse plug in the socket. If, while the current is applied to the iron, a short circuit` occurs in its internal circuit which includes the fuse, the latter will blow and-cut olf the current.`

heat from the sole-plate to the socket and having a metal part adapted to engage asurface on the sole-plate and to conduct heat from the sole-plate tothe fuse,

and a circuit extending through the resistance and plug.

3. In an electrically heated fiat iron, aV

solelate, a resistance for heating. the same, a soc et on the iron, a fuse plug fitting said socketA and having a metal'part adapted to engage a surface on the sole-plate at a point removed from the resistance an? to conduct use.

4. In an electric fiat iron, a heating resistance and a metal body, in series with the resistance, adapted to be heated by the iron, a socketvof insulating material mounted on the iron and having an internal threaded contact shell, and a hollow fuse plug having athreaded side contact engaging said shell, a base `contact engaging said body, and a fuse within the plug connected to said side and base contacts.

5. In an electric fiat iron,a heating resistance and a metal body, in series with the v resistance, adapted to be heated by the iron,

a socket of insulating material mounted on the iron and havingV an internal threaded contact shell, said socket having its lower end open, and a hollow fuse plug extending through the socket to said body, said plug having a threaded side contact engaging said shell, a base contact engaging said body, and a fuse within the plug connected to said side and base contacts v y In testimony whereof I aiix my signature.

WILLIAM T. 'HOOFNAGLE fiat iron, a 5o 

